export default class calc {
  // 加法函数
  static add(arg1, arg2) {
    let r1, r2, m
    try {
      r1 = arg1.toString().split('.')[1].length
    } catch (e) {
      r1 = 0
    }
    try {
      r2 = arg2.toString().split('.')[1].length
    } catch (e) {
      r2 = 0
    }
    m = Math.pow(10, Math.max(r1, r2))
    return (arg1 * m + arg2 * m) / m
  }
  // 减法函数
  static sub(arg1, arg2) {
    let r1, r2, m, n
    try {
      r1 = arg1.toString().split('.')[1].length
    } catch (e) {
      r1 = 0
    }
    try {
      r2 = arg2.toString().split('.')[1].length
    } catch (e) {
      r2 = 0
    }
    m = Math.pow(10, Math.max(r1, r2))
    // last modify by deeka
    // 动态控制精度长度
    n = r1 >= r2 ? r1 : r2
    return ((arg2 * m - arg1 * m) / m).toFixed(n)
  }

  // 乘法函数，用来得到精确的乘法结果
  static mul(arg1, arg2) {
    let m = 0
    const s1 = arg1.toString()
    const s2 = arg2.toString()
    try {
      m += s1.split('.')[1].length
    } catch (e) {
      console.log(e)
    }
    try {
      m += s2.split('.')[1].length
    } catch (e) {
      console.log(e)
    }
    return (
      (Number(s1.replace('.', '')) * Number(s2.replace('.', ''))) /
      Math.pow(10, m)
    )
  }
  // 除法函数，用来得到精确的除法结果
  static div(arg1, arg2) {
    let t1 = 0,
      t2 = 0,
      r1,
      r2
    try {
      t1 = arg1.toString().split('.')[1].length
    } catch (e) {
      console.log(e)
    }
    try {
      t2 = arg2.toString().split('.')[1].length
    } catch (e) {
      console.log(e)
    }
    r1 = Number(arg1.toString().replace('.', ''))
    r2 = Number(arg2.toString().replace('.', ''))
    return (r1 / r2) * Math.pow(10, t2 - t1)
  }
}
